Phase separating electrode materials - chemical inductors?

Klemen Zelič, Igor Mele, Arghya Bhowmik*, Tomaž Katrašnik

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We unreveal mechanistic background of the presence of chemical inductive effects in phase separating ion intercalation energy storage materials, in particular lithium iron phosphate (LFP) and lithium titanate oxide (LTO), by applying a detailed phase field model. These materials feature fast (de)intercalation and slow diffusion relaxation phenomena, which are prerequisites for observing such inductive effects. The results are based on the mechanistic model and analytical considerations, which show that all equilibrium states that lie within the miscibility gap of the phase-separating material exhibit a strong inductive response in the low frequency part of the spectrum. We also explain why such inductive effects are not observed outside the miscibility gap. In this letter, we present the first mechanistic justification for the previously reported experimental observation of electrode level inductance in impedance measurements at low currents.
Original languageEnglish
JournalEnergy Storage Materials
Volume56
Pages (from-to)489-494
Number of pages6
ISSN2405-8297
DOIs
Publication statusPublished - 2023

Bibliographical note

The authors acknowledge support from the European Unions Horizon 2020 research and innovation programme under Grant Agreement No. 957189 (BIG-MAP). The authors also acknowledge financial support from the Slovenian Research Agency (research core funding No. P2-0401).

Keywords

  • Electrochemical impedance spectrum
  • Phase separating electrode material
  • LFP
  • Phase field modeling
  • Chemical inductor

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